A reaction involved in the formation of ozone in the upper...

A reaction involved in the formation of ozone in the upper atmosphere is $\mathrm{O}_{2} \longrightarrow$ 2 O. Without referring to Table $10.3,$ indicate whether this reaction is endothermic or exothermic. Explain.

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Key Concepts

Endothermic Reaction

An endothermic reaction is one that absorbs energy from its surroundings during the course of the reaction. This energy absorption is necessary when the energy required to break bonds in the reactants (such as the strong O–O bond in O2) exceeds the energy released from forming new bonds in the products.

Bond Dissociation Energy

Bond dissociation energy is the precise amount of energy needed to break a bond between two atoms in a molecule. In reactions where bonds are broken, such as the splitting of an oxygen molecule into two oxygen atoms, this energy must be supplied, making the process endothermic if no offsetting energy is released.

Photodissociation in Atmospheric Chemistry

Photodissociation refers to the breaking of chemical bonds through the absorption of light, typically ultraviolet radiation. In the upper atmosphere, ultraviolet light provides the energy necessary to overcome the high bond dissociation energy of oxygen molecules, leading to the formation of atomic oxygen which is crucial in subsequent ozone formation reactions.

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